What temperature is too hot to seal pavers?

ICPI Tech Spec 5 does not set a maximum sealing temperature for pavers. What it says instead is that "Water based sealer curing time will vary with the temperature, wind conditions and humidity," folding heat into cure time as one variable among several rather than a limit.

Its own instruction points away from itself: "The sealer manufacturer or supplier should be consulted prior to using any sealer to verify that their product will perform in the environment planned for its use." A trade institute naming no ceiling and pointing to the label is itself the finding.

Where ICPI is silent, the makers are specific, and their numbers do not line up. The ASCC row is a decorative concrete guide, printed for comparison, not a paver maker.

SEK-Surebond is the one maker read here that prints a surface maximum apart from its air window: SB-1300 goes on when day and night temperatures are between 40 and 95 F, and the surface temperature should not exceed 120 F during application. Its TB17 bulletin adds that when the surface is too cool or too hot the sealer will not absorb well. The ASCC guide, for decorative concrete, applies its own 45 to 90 F range to the air and the concrete together.

SEK-Surebond's TB17 names the tool for telling the two apart: "an infrared temperature meter is a useful tool to determine surface temperature." No source read here publishes how far a sunny surface runs above the air. Where those conditions sit in the whole sealing sequence is set out under the conditions, faults and limits of the sequence.

None of these ceilings is a rule for Naples. What Naples' normal summer highs do against them, and why the ASCC guide points warm-weather work to early morning or late evening, is answered on sealing pavers in summer heat, and the same labels' lower limits, read against a cool night, are covered on sealing pavers in winter in Naples.

Outside its range, the ASCC guide says, a water based sealer can bubble, turn white or dry chalky; bubbles as a failure are their own question on what causes bubbles in paver sealer. The label on the product actually being applied, and its printed window, is what a given day is checked against.